The term "porn princess" is a polite diminutive retrograde form of the more widespread term "porn queen". It does not imply her behavior is any less lewd or immoral or kinky.

"...Jenna Jameson wants the world to officially remember her for her iconic porn princess name. Earlier this week the knocked-up starlet filed legal papers to become 'Jenna Jameson' and permanently move on from her birth name, Jenna Marie Massoli."
-- from Rumorficial Celebrity Gossip, Nov. 2008